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how to make new variables and values in for loop

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Young Chan Jung
Young Chan Jung 2019 年 6 月 17 日
Edited: madhan ravi 2019 年 6 月 17 日
I want to make and define variables with for loop like:
for i=1:3
something
Ai = ...
something
end
so that after running this, I have defined variables of Ai, or A1, A2, A3 in this case
I tried to search and found out there is something such as A{i} or saving values to arrays, but in the end I need to transform them again as the above and get separate defined variables...
Thank you.

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Stephen Cobeldick
Stephen Cobeldick 2019 年 6 月 17 日
"I have defined variables of Ai, or A1, A2, A3 in this case"
Do NOT do this. The MATLAB documentation specifically recommends against dynamically accessing variable names, as do all experienced MATLAB users. Read this to know why:
"I tried to search and found out there is something such as A{i} or saving values to arrays,"
This is exactly what you should do. Indexing is simple, neat, easy to debug, and very efficient (unlike what you are trying to do).
":..but in the end I need to transform them again as the above and get separate defined variables..."
I very much doubt that you "need" to do that. Please explain your usecase in more detail.
madhan ravi
madhan ravi 2019 年 6 月 17 日
Adding to Stephen‘s comment , also learn to preallocate!

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採用された回答

Star Strider
Star Strider 2019 年 6 月 17 日
Please do not create numbered variables!
If you want varying values for different iterations, subscript ‘A’ instead:
A(i) = ...
or:
A{i} = ...
depending upon what you want to do, and the size of ‘A’.

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